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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Ordo: Therapsida
Cladus: Theriodontia
Subordo: Cynodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohort: Theria
Cohort: Eutheria
Cohort: Placentalia
Cladus: Boreoeutheria
Superordo: Euarchontoglires
Ordo: Rodentia
Subordo: Sciuromorpha

Familia: Sciuridae
Subfamilia: Xerinae
Tribus: Marmotini
Genus: Tamias
Species: Tamias senex
Subspecies: T. s. pacifica – T. s. senex

Tamias senex J.A. Allen, 1890

Tamias senex in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.


North American Mammals: Tamias senex [1]

Vernacular names
English: Allen's Chipmunk

Allen's chipmunk (Neotamias senex) is a species of chipmunk. It is also known as the shadow chipmunk.[1] It is native to the western United States, where it occurs in California, Nevada, and Oregon. It is a common species of the Sierra Nevada.[1] Neotamias senex's length measures about 229-261 mm. Female chipmunks are larger compared to males, with a dimorphism ratio of 1.033. Females weigh around 73.0 grams to 108.5 grams, while males weigh 66.8 grams to 99.3 grams.[2][3]

This chipmunk generally prefers mature coniferous forests and chaparral slopes dominated by ponderosa pine, Jeffrey pine, sugar pine, black oak, Douglas fir, white fir, red fir, incense cedar, and mountain hemlock. The shrub layer includes buckbrush, manzanita, blackberry, and chinquapin. A study in the Sierra Nevada found that Allen's chipmunk was more abundant in red fir than in mixed conifer woodland.[4]

Like other chipmunks, Allen's chipmunk is omnivorous. Their diet consists largely of vegetation: mushrooms, berries, nuts, shoots, seeds and grains. But chipmunks also eat other animals, including insects, frogs, bird eggs and occasionally baby birds. They are in turn prey for minks, weasels, and owls. Allen's chipmunk is active all year round except during stretches of harsh winter weather.[1]

Cassola, F. (2016). "Neotamias senex". IUCN Red List of Threatened Species. 2016: e.T42579A22268269. doi:10.2305/IUCN.UK.2016-2.RLTS.T42579A22268269.en. Retrieved 17 November 2021.
Winans, Marie; Avalos, Nancy. "Tamias senex (Allen's chipmunk)". Animal Diversity Web. Retrieved 2021-10-29.
"NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2021-10-29.

Coppeto, Stephanie A. "Habitat Associations of Small Mammals at Two Spatial Scales in the Northern Sierra Nevada". Oxford Academic. Journal of Mammology. Retrieved 5 March 2021.

Further reading

Thorington, R. W. Jr. and R. S. Hoffman. 2005. Family Sciuridae. pp. 754–818 in Mammal Species of the World: A Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder, eds. Johns Hopkins University Press, Baltimore.

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